Usage History of 'chromosphere'

The following chart shows how frequently 'chromosphere' appeared in printed materials over time. For example, the word 'chromosphere' occurred 4 times in books in 1817 and 2,818 times in 2008. From 1817 to 2008, the word 'chromosphere' was used a total of 220,640 times in books scanned by Google. See Reference: Google Ngram project.

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